Online Parts Store › Phillips Machine Screw - Flat Head, 3/8"-16 x 3" Image 1 of 1 Phillips Machine Screw - Flat Head, 3/8"-16 x 3" $31.11 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Stainless Fender Washer 1/4", .062" Thick, OD 1-1/2 $103.98 Lag Screw, 3/8 x 1-1/2" $63.91 Flat Washer, 5/16", .062" Thick, OD 7/8" $52.44 Flat Washer, 1/4", .050" Thick, OD 11/16" $17.26 Phillips Tapping Screws - Flat Head, #8 x 1-1/4" $19.34